E-Flora BC: Electronic Atlas of the Flora of British Columbia

Allium cernuum Roth
Nodding Onion
Amaryllidaceae (Lily family)
(Previously in Liliaceae)

Introduction to Vascular Plants

© Gary Lewis  Email the photographer   (Photo ID #5313)

E-Flora BC Static Map
Distribution of Allium cernuum
Click here to view our interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.



General:
Perennial herb from an elongate, long-necked, narrowly egg-shaped, scaly bulb, the outer scales membranous, without a fibrous network, the inner scales faintly pinkish, the bulbs often clustered; flowering stems erect but down-curved near the top, 10-50 cm tall, slender, often somewhat angled, smooth.
Leaves:
Basal leaves several per bulb, linear, flat to channeled, shorter than the flowering stem, about 3 mm wide, smooth, the margins entire or minutely toothed; stem leaves lacking.
Flowers:
Inflorescence a compact, terminal, nodding umbel of several to many, stalked flowers, above 2 membranous bracts, the stalks 1-3 cm long, the bracts soon deciduous; flowers pink to rose-purple or whitish, bell-shaped, of 6 distinct tepals, the tepals 4-6 mm long, elliptic-egg-shaped, blunt; stamens 6, exserted; pistil 1, 3-chambered.
Fruits:
Capsules, more or less egg-shaped, 3-lobed, with 6 crests, 2 on each lobe; seeds 6 or fewer, dull-black.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry to mesic rocky bluffs, grassy slopes, meadows and open forests in the lowland and steppe to subalpine zones; common in BC south of 56degreeN; E to ON and S to NY, NC, GA, MS, TX, WY, UT, ID and OR.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Allium cernuum

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 122 1117 2400
Slope Gradient (%) 0 33 244
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 192 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 6
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
1746
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: AT(21), BG(127), BWBS(5), CDF(3), CWH(1), ESSF(182), ICH(53), IDF(855), IMA(1), MS(213), PP(154), SBPS(10), SBS(57)

Ecological Indicator Information

A shade-intolerant, montane to subalpine, transcontinental North American forb. Occurs on nitrogen-medium, water-shedding sites within boreal, temperate, and cool mesothermal climates. Its occurrence decreases with increasing precipitation and latitude. Occasional in early-seral communities on shallow soils of rock outcrops; frequently inhabits exposed mineral soils. Characteristic of summer-dry temperate and mesothermal forests.

SourceIndicator Plants of Coastal British Columbia (Information applies to coastal locations only)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References